package com.athuawei.juc;

import java.util.concurrent.CountDownLatch;

// 演示CountDownLatch
public class CountDownLatchDemo {

    public static void main(String[] args) throws InterruptedException {

        //1.创建一个CountDownLatch对象，设置初始值
        CountDownLatch countDownLatch = new CountDownLatch(6);

        //2.
        for(int i = 1; i <= 6; i++) {
            new Thread(()->{
                System.out.println(Thread.currentThread().getName()
                        + " 号同学离开了教室......");

                // 计数 -1
                countDownLatch.countDown();
            }, String.valueOf(i)).start();
        }

        countDownLatch.await();
        System.out.println(Thread.currentThread().getName() +
                " 班长锁门走人了！!!!");
    }
}
